Epson Stylus Pro 4000 Reference Manual page 254

Loading paper smaller than A3 in a paper tray
1. Make sure that the printer is on and in the READY status.
2. Lift up the paper tray cover, and pull the paper guide roller.
3. Pull the paper guide, and slide the edge guide to the left as
far as it will go.
4. Clean the inside of the paper tray to remove any dust. The
dust may decrease the printout quality.
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Paper Handling